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Note 17 - Subsequent Events	12 Months Ended
Note 17 - Subsequent Events	Dec. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	17. Subsequent Events None noted except those events described below and in Note 1 to the consolidated financial statements for the year ended December 31, 2018. HCS Group GmbH – In February 2019, the Company entered into a long-term, “take or pay” renewable isooctane purchase and sale agreement with HCS Group GmbH ("HCS") supply renewable isooctane. The Company believes that this long-term, “take or pay” purchase and sale agreement with HCS is an important step forward in our previously-announced strategy to build out the Company's advanced biofuels production facility in Luverne, Minnesota to increase the production of isobutanol and renewable jet fuel and isooctane derived from renewable isobutanol.